national security agency was reportedly monitoring up to 35 foreign leaders. european union officials are in washington to meet with white house aides and congressional leaders today. the europeans say they want guarantees of no more american surveillance. >>> american officials who survived last year's attack in benghazi and libya tell "60 minutes" they knew for months an assault was coming. the attack killed ambassador chris stephens and three other americans. lara logan spent the full year reporting last night's story. steven's deputy told lara on the night of the assault she was told early on no military backup would come. >> you have this conversation with the defense attache, ask him what military assets are on their way and he says -- >> effectively, they're not. and i for a moment -- i just felt lost. i just couldn't believe the answer. and then i made the call to the chief and told him, listen, you've got to tell those guys there may not be any help coming. >> that's a tough thing to understand. why? >> it just is. we -- for us, for the people that go